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【简答题】
所有植物生活细胞的细胞壁都具有胞间层、和次生壁。( )
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【简答题】用简便的化学方法鉴别下列各组化合物 1 、用简便的化学方法鉴别以下化合物: (A) 1- 己烯 (B) 1- 己炔 (C) 1- 己醇 (D) 2- 己醇
【简答题】用简便的化学方法鉴别下列各组化合物 1 、用简便的化学方法鉴别以下化合物的水溶液: (A) 甲醛 (B) 乙醛 (C) 丙醛 (D) 丙酮 2 、用简便的化学方法鉴别以下化合物: (A)1- 戊醇 (B)2- 戊醇 (C)3- 戊醇 (D)2- 甲基 -2- 丁醇
【单选题】He said that the situation was dangerous and that there was no time to ______ in reaching an agreement.
A.
spend
B.
save
C.
take
D.
lose
【简答题】阅读理解 Books have been our best friends from time immemorial. There was a time when reading them was supposed to be the best way of entertainment. Book lovers used to carry the book of their choice wher...
【单选题】There was a time ＿＿ Tom was interested in music.
A.
which
B.
on which
C.
what
D.
when
【简答题】用简便的化学方法鉴别以下化合物: ( A )丙醇 ( B )丙醛 ( C )丙酸
【单选题】You needn’t have ________ the speaker when he was speaking; there was enough time afterwards for you to ask questions.
A.
affected
B.
interrupted
C.
involved
D.
disturbed
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